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| Modeling of the Competition between Uranyl Nitrate and Nitric Acid upon Extraction with Tri-n-butyl Phosphate | |
| Tan, Boren1,2; Chang, Chao1; Xu, Dongbing1; Wang, Yong1; Qi, Tao1 | |
| 2020-06-02 | |
| Source Publication | ACS OMEGA
 |
| ISSN | 2470-1343 |
| Volume | 5Issue:21Pages:12174-12183 |
| Abstract | Uranium is a strategic element and plays an important role in energy resources. A H2O-HNO3-UO2(NO3)(2)-TBP (tri-n-butyl phosphate)-diluent system is commonly used for uranium separation and purification in liquid-liquid extraction. Uranyl nitrate is promoted by the existence of nitrate at low HNO3 concentrations but is inhibited at high HNO3 concentrations. Considering the competitive extraction between HNO3 and UO2(NO3)(2), a generic extraction model is developed. The activities of components in the aqueous phase were estimated using Pitzer models. The thermodynamic equilibrium constants and Pitzer parameters were regressed by experimental data. The resulting model was able to successfully predict uranyl nitrate, nitric acid, and water extraction over a large range of conditions (U, 0-1.8 mol/L; HNO3, 0-10 mol/L; TBP, 5-100 vol %) within average absolute relative deviations of 11.2, 15.7, and 23.8%, respectively. The predicted results show that water and nitric acid were extracted as di-solvates HNO3 center dot(TBP)(2)center dot H2O and (TBP)(2)center dot 2H(2)O at low nitric acid concentrations, with the formation of mono-solvates HNO3 center dot TBP and HNO3 center dot TBP center dot H2O as the acid concentration increased. Uranyl nitrate was shown to be rejected from the organic phase as the formation of HNO3 center dot TBP and HNO3 center dot TBP center dot H2O in acid was extracted at high acid concentrations. |
| DOI | 10.1021/acsomega.0c00583 |
| Language | 英语 |
| WOS Keyword | TRIBUTYL-PHOSPHATE ; ACTIVITY-COEFFICIENTS ; AQUEOUS-SOLUTIONS ; CHEMICAL-MODEL ; WATER ; SYSTEM ; EQUILIBRIA ; SOLVENT ; DILUENT ; TBP |
| Funding Project | Science and Technology Service Network Initiative[KFJ-STS-QYZD-081] ; National Key R&D Program of China[2019YFC1907700] |
| WOS Research Area | Chemistry |
| WOS Subject | Chemistry, Multidisciplinary |
| Funding Organization | Science and Technology Service Network Initiative ; National Key R&D Program of China |
| WOS ID | WOS:000538419300034 |
| Publisher | AMER CHEMICAL SOC |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.ipe.ac.cn/handle/122111/41122 |
| Collection | 中国科学院过程工程研究所 |
| Corresponding Author | Wang, Yong; Qi, Tao |
| Affiliation | 1.Chinese Acad Sci, Natl Engn Lab Hydromet Cleaner Prod Technol, Inst Proc Engn, Beijing 100089, Peoples R China 2.Univ Chinese Acad Sci, Beijing 101400, Peoples R China |
| Recommended Citation GB/T 7714 | Tan, Boren,Chang, Chao,Xu, Dongbing,et al. Modeling of the Competition between Uranyl Nitrate and Nitric Acid upon Extraction with Tri-n-butyl Phosphate[J]. ACS OMEGA,2020,5(21):12174-12183. |
| APA | Tan, Boren,Chang, Chao,Xu, Dongbing,Wang, Yong,&Qi, Tao.(2020).Modeling of the Competition between Uranyl Nitrate and Nitric Acid upon Extraction with Tri-n-butyl Phosphate.ACS OMEGA,5(21),12174-12183. |
| MLA | Tan, Boren,et al."Modeling of the Competition between Uranyl Nitrate and Nitric Acid upon Extraction with Tri-n-butyl Phosphate".ACS OMEGA 5.21(2020):12174-12183. |
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